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XPath function: string namespace-uri (node-set?)

Standard excerpt:

The namespace-uri function returns the namespace URI of the expanded-name of the node in the argument node-set that is first in document order. If the argument node-set is empty, the first node has no expanded-name, or the namespace URI of the expanded-name is null, an empty string is returned. If the argument is omitted, it defaults to a node-set with the context node as its only member. Examples (xslt:xml): Overview
74:2 74:14

Interactive xlab: [xpath] [xsl:value-of] [xsl:template]